package com.atguigu.gulimall.product.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.gulimall.product.service.CategoryBrandRelationService;
import com.atguigu.gulimall.product.vo.Catelog2Vo;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.cache.annotation.Caching;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {
//    @Autowired
//    CategoryDao categoryDao ;
    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;
    @Autowired
    private StringRedisTemplate redisTemplate;
    @Autowired
    RedissonClient redisson;
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
//    1    查询所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
//        2    组装成父子的树形结构
//            2.1 找到所有的一级分类
        List<CategoryEntity> level1Menus = entities.stream().filter(categoryEntity ->
            categoryEntity.getParentCid() == 0
        ).map((menu)->{
           menu.setChildren(getChildrens(menu,entities));
           return menu ;
        }).sorted((menu1,menu2)->{
            return  (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort()) ;
        }).collect(Collectors.toList());
        return level1Menus;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 1、检查当前的菜单，是否被别的地方引用
        baseMapper.deleteBatchIds(asList) ;
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> paths = new ArrayList<>( );
        List<Long> parentPath = findParentPath(catelogId, paths);

        Collections.reverse(parentPath);
        return parentPath.toArray(new Long[parentPath.size()]);
    }
//    @Caching(evict ={@CacheEvict(value = {"catagory"},key = "'getLevel1Category'"),
//            @CacheEvict(value = {"catagory"},key = "'getCatalogJson'")
//})
@CacheEvict(value = "catagory",allEntries = true)
@Transactional
    @Override
    public void updateCascade(CategoryEntity category) {
        this.updateById(category);
        categoryBrandRelationService.updateCategory(category.getCatId(),category.getName()) ;
    }
    @Cacheable(value = {"catagory"},key = "#root.method.name",sync = true)
    @Override
    public List<CategoryEntity> getLevel1Category() {
        System.out.println("getLevel1Category...............");
        long l = System.currentTimeMillis();
        List<CategoryEntity> categoryEntities = baseMapper.selectList(new QueryWrapper<CategoryEntity>().eq("parent_cid", 0));
        System.out.println("消耗时间："+(System.currentTimeMillis()-l));
        return categoryEntities;
    }
    @Cacheable(value = "catagory",key ="#root.methodName" )
    @Override
    public Map<String, List<Catelog2Vo>> getCatalogJson() {
        System.out.println("查询了数据库");

        //将数据库的多次查询变为一次
        List<CategoryEntity> selectList = this.baseMapper.selectList(null);

        //1、查出所有分类
        //1、1）查出所有一级分类
        List<CategoryEntity> level1Categorys = getParent_cid(selectList, 0L);

        //封装数据
        Map<String, List<Catelog2Vo>> parentCid = level1Categorys.stream().collect(Collectors.toMap(k -> k.getCatId().toString(), v -> {
            //1、每一个的一级分类,查到这个一级分类的二级分类
            List<CategoryEntity> categoryEntities = getParent_cid(selectList, v.getCatId());

            //2、封装上面的结果
            List<Catelog2Vo> catelog2Vos = null;
            if (categoryEntities != null) {
                catelog2Vos = categoryEntities.stream().map(l2 -> {
                    Catelog2Vo catelog2Vo = new Catelog2Vo(v.getCatId().toString(), null, l2.getCatId().toString(), l2.getName().toString());

                    //1、找当前二级分类的三级分类封装成vo
                    List<CategoryEntity> level3Catelog = getParent_cid(selectList, l2.getCatId());

                    if (level3Catelog != null) {
                        List<Catelog2Vo.Catalog3Vo> category3Vos = level3Catelog.stream().map(l3 -> {
                            //2、封装成指定格式
                            Catelog2Vo.Catalog3Vo category3Vo = new Catelog2Vo.Catalog3Vo(l2.getCatId().toString(), l3.getCatId().toString(), l3.getName());

                            return category3Vo;
                        }).collect(Collectors.toList());
                        catelog2Vo.setCatalog3List(category3Vos);
                    }

                    return catelog2Vo;
                }).collect(Collectors.toList());
            }

            return catelog2Vos;
        }));

        return parentCid;
    }

    public Map<String, List<Catelog2Vo>> getCatalogJson2(){
        String catalogJSON = redisTemplate.opsForValue().get("catalogJSON");
        if(StringUtils.isEmpty(catalogJSON)){
            System.out.println("缓存不命中。。。查询数据库");
            Map<String, List<Catelog2Vo>> catalogJsonFromDb = getCatalogJsonFromDbWithRedisLock();
            return catalogJsonFromDb;
        }
        System.out.println("缓存命中。。。直接返回");
        Map<String, List<Catelog2Vo>> result = JSON.parseObject(catalogJSON,new TypeReference<Map<String, List<Catelog2Vo>>>(){});
        return result ;
    }
    public Map<String, List<Catelog2Vo>> getCatalogJsonFromDbWithlocalLock() {
        synchronized (this){
            return getDataFromDb();
        }
    }
    public Map<String, List<Catelog2Vo>> getCatalogJsonFromDbWithRedissonLock() {
        RLock lock = redisson.getLock("catalogJson-lock");
        lock.lock();
        System.out.println("获取分布式锁成功");
            Map<String, List<Catelog2Vo>> dataFromDb ;
            try {
               dataFromDb = getDataFromDb();
            }finally {
                lock.unlock();
            }
//            String lockValue = redisTemplate.opsForValue().get("lock");
//            if(uuid.equals(lockValue)) {
//                redisTemplate.delete("lock");
//            }

            return dataFromDb;
    }
    public Map<String, List<Catelog2Vo>> getCatalogJsonFromDbWithRedisLock() {
        String uuid = UUID.randomUUID().toString();
        Boolean lock = redisTemplate.opsForValue().setIfAbsent("lock", uuid,300,TimeUnit.SECONDS);
        if(lock){
            System.out.println("获取分布式锁成功");
            Map<String, List<Catelog2Vo>> dataFromDb ;
            try {
               dataFromDb = getDataFromDb();
            }finally {
                String script = "if redis.call(\"get\",KEYS[1]) == ARGV[1] then\n" +
                        "    return redis.call(\"del\",KEYS[1])\n" +
                        "else\n" +
                        "    return 0\n" +
                        "end";
                //删除锁
                Long lock1 = redisTemplate.execute(new DefaultRedisScript<Long>(script, Long.class), Arrays.asList("lock"), uuid);
            }
//            String lockValue = redisTemplate.opsForValue().get("lock");
//            if(uuid.equals(lockValue)) {
//                redisTemplate.delete("lock");
//            }

            return dataFromDb;
        }else{
            System.out.println("获取分布式锁失败。。等待重试");
            try {
                Thread.sleep(200);
            } catch (InterruptedException e) {

            }
            return getCatalogJsonFromDbWithRedisLock();
        }
    }

    private Map<String, List<Catelog2Vo>> getDataFromDb() {
        String catalogJSON = redisTemplate.opsForValue().get("catalogJSON");
        if (!StringUtils.isEmpty(catalogJSON)) {
            Map<String, List<Catelog2Vo>> result = JSON.parseObject(catalogJSON, new TypeReference<Map<String, List<Catelog2Vo>>>() {
            });
            return result;
        }
        System.err.println("查询了数据库。。。");
        List<CategoryEntity> selectList = baseMapper.selectList(null);

        List<CategoryEntity> level1Category = getParent_cid(selectList, 0L);
        Map<String, List<Catelog2Vo>> parent_cit = level1Category.stream().collect(Collectors.toMap(k -> k.getCatId().toString(), v -> {
            List<CategoryEntity> categoryEntities = getParent_cid(selectList, v.getCatId());
            List<Catelog2Vo> catelog2Vos = null;
            if (categoryEntities != null) {
                catelog2Vos = categoryEntities.stream().map(l2 -> {
                    Catelog2Vo catelog2Vo = new Catelog2Vo(v.getCatId().toString(), null, l2.getCatId().toString(), l2.getName());
                    List<CategoryEntity> level3Catelog = getParent_cid(selectList, l2.getCatId());
                    if (level3Catelog != null) {
                        List<Catelog2Vo.Catalog3Vo> collect = level3Catelog.stream().map(l3 -> {
                            Catelog2Vo.Catalog3Vo catalog3Vo = new Catelog2Vo.Catalog3Vo("", l3.getCatId().toString(), l3.getName());
                            return catalog3Vo;
                        }).collect(Collectors.toList());
                        catelog2Vo.setCatalog3List(collect);
                    }
                    return catelog2Vo;
                }).collect(Collectors.toList());
            }
            return catelog2Vos;
        }));
        String s = JSON.toJSONString(parent_cit);
        redisTemplate.opsForValue().set("catalogJSON", s, 1, TimeUnit.DAYS);
        return parent_cit;
    }

    private List<CategoryEntity> getParent_cid(List<CategoryEntity> selectList,long parent_cid) {
        List<CategoryEntity> collect = selectList.stream().filter(item -> item.getParentCid() == parent_cid).collect(Collectors.toList());
        return collect ;
        //        return baseMapper.selectList(new QueryWrapper<CategoryEntity>().eq("parent_cid", v.getCatId()));
    }

    private List<Long> findParentPath(Long catelogId,List<Long> paths){
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if(byId.getParentCid()!=0){
            findParentPath(byId.getParentCid(),paths);
        }
        return paths ;
    }

    //递归查找所有菜单的子菜单
    private List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){
        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
            categoryEntity.setChildren(getChildrens(categoryEntity,all));
            return   categoryEntity ;
        }).sorted((menu1,menu2)->{
            return   (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort()) ;
        }).collect(Collectors.toList());
        return children;
    }
}